Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000101 00010001 or 00010101.

A260604

Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000101 00010001 or 00010101.

Terms

    a(0) =125a(1) =250a(2) =610a(3) =1334a(4) =3343a(5) =7516a(6) =19069a(7) =42696a(8) =108592a(9) =244492a(10) =620922a(11) =1394188a(12) =3543940a(13) =7964144a(14) =20236020a(15) =45470332a(16) =115549194a(17) =259609220a(18) =659718394a(19) =1482402604a(20) =3766971094a(21) =8463829616a(22) =21508165126a(23) =48327274404a(24) =122806995718

External references